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17981 (1999 JZ56)
Classification: Main-belt Asteroid          SPK-ID: 2017981
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07424981665547524 2.7969e-08  
a 3.158252877195232 1.4699e-08 au
q 2.923753180111859 8.6357e-08 au
i 1.500348413872818 3.5207e-06 deg
node 42.63459407272245 0.00012645 deg
peri 46.82390976646447 0.00012902 deg
M 120.6947655646438 2.5689e-05 deg
tp 2458709.186756348642
(2019-Aug-13.68675635)
0.00014536 TDB
period 2050.070411562003
5.61
1.4312e-05
3.918e-08
d
yr
n .1756037246182713 1.226e-09 deg/d
Q 3.392752574278605 1.5791e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2642  
   data-arc span      15213 days (41.65 yr)  
   first obs. used      1979-11-14  
   last obs. used      2021-07-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .48214  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 14:28:43  

Additional Information
 Earth MOID = 1.94055 au 
 Jupiter MOID = 1.74919 au 
 T_jup = 3.201 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.26   n/a MPO636335  
diameter diameter 9.965 km 0.260 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 3.134 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.070   0.010 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

17981 (1999 JZ56)          Discovered 1999-May-10 by LINEAR at Socorro
Reference: 20001013/Numbers.arcLast Updated: 2004-04-19

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Alternate Designations
 1999 JZ56 = 1979 VV2 = 1990 TV7 = 1998 FK20 = 2000 NP25 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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